Sian Barbara Allen (July 12, 1946 – March 31, 2025)[1] was an American actress who mainly appeared on television throughout the 1970s. A native of Reading, Pennsylvania, Allen studied at the Pasadena Playhouse before appearing in her first screen role on the series O'Hara, U.S. Treasury in 1971. She went on to appear in numerous television series in the ensuing years, including recurring appearances on The Waltons, Gunsmoke, and Ironside.[2]

She starred in several television films, including Scream, Pretty Peggy (1973) and The Lindbergh Kidnapping Case (1976). In addition to her television credits, Allen starred in two feature films: the thriller You'll Like My Mother (1972) and the Western Billy Two Hats (1974). For her performance in You'll Like My Mother, Allen was nominated for a Golden Globe Award for New Star of the Year.